Summary

• add a discriminated tool_output configuration: { truncate: false } disables shared truncation, while the enabled variant accepts max_lines and max_bytes
• reject configurations that combine truncate: false with threshold values
• bypass truncation for generic, MCP, plugin, and streaming shell tool output when disabled
• omit shell truncation guidance when disabled and document the public configuration
• update the built-in customization skill to consult https://opencode.ai/config.json selectively rather than advocate disabling truncation
• regenerate the JavaScript SDK config type

Configuration

{
  "tool_output": {
    "truncate": false
  }
}

Or configure thresholds while truncation is enabled:

{
  "tool_output": {
    "max_lines": 200,
    "max_bytes": 8192
  }
}

These variants cannot be combined.

Verification

• bun test test/config/config.test.ts test/tool/truncation.test.ts test/tool/shell.test.ts from packages/opencode
• bun run build from packages/web
• ./packages/sdk/js/script/build.ts
• git diff --check

Addresses the configuration and documentation portions of #13770. Other reported behavior concerns in that issue remain separate.